export const setToken = (token)=>{
  localStorage.setItem('TOKEN',token)
}
export const getToken = ()=>{
  return localStorage.getItem('TOKEN')
}
export const removeToken = ()=>{
  localStorage.removeItem('TOKEN')
}
// removeItem(“key”)：删除名称为“key”的信息，这个key所对应的value也会全部被删除
// clear()：清空localStorage中所有信息